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They're definitely cool.

The modern 475 and 500 cartridges in light 3-1/2 pound guns are better

500JRH with 440 grains at 1350fps
475 Linebaugh with 420 grains at 1350fps
With these cartridges you're in the range of 1700-1800 ft/lbs energy

If it weren't for the "destructive device" regulations, we'd be building modern 577 revolvers too.

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I didn't think you cousins over the pond had 'regulations' as to what size hand cannons you could fire?